Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

Kiriya, Miho; Okuda, Tomoaki; Yamazaki, Harutake; Hatoya, Kazuki; Kaneyasu, Naoki; Uno, Itsushi; Nishita, Chiharu; Hara, Keiichiro; Hayashi, Masahiko; Funato, Koji; Inoue, Kôzô; Yamamoto, Shigekazu; Yoshino, Akira; Takami, Akinori

doi:10.20944/preprints201706.0040.v1

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…For example, hygroscopic growth and existence of certain chemical species may facilitate chemical reactions on aerosol surface or in bulk, which contribute to the particle toxicity towards human cells 27 , 28 . Particle growth could also increase the surface area for interactions between aerosols and cell membranes 29 .…”

Section: Discussionmentioning

confidence: 99%

Aerosol mixing state matters for particles deposition in human respiratory system

Ching

Kajino

2018

Sci Rep

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Aerosol particles emitted from various human activities deteriorate air quality and are suggested to increase public health risk. Numerous studies have emphasized the relationship between the mass and/or number concentration of aerosols (or commonly known as particulate matter (PM)) in the atmosphere and the incidence of respiratory and cardiovascular diseases, while very few have examined the deposition efficiency of inhaled particles in the respiratory tract. We present the first examination of particles deposition based on, detailed simulation of aerosol physico-chemical properties by a recently developed particle-resolved aerosol model and the mixing state dependent hygrosocpic growth and deposition computed at particle-level by deposition model. Furthermore, we elucidate the impact of mixing state on deposition efficiency by using a recently introduced aerosol mixing state index. We find that without considering mixing-state-dependent hygroscopic growth of particles leads to overestimation of deposition efficiency; whereas considering an average mixing state leads to underestimation of 5% to 20% of soot particle deposition efficiency in human alveoli. We conclude that aerosol mixing state, which evolves during the interaction between atmospheric chemistry and meteorology, is important for the comprehensive evaluation of air quality and its implication to public health requires further investigation.

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Section: Discussionmentioning

confidence: 99%

Aerosol mixing state matters for particles deposition in human respiratory system

Ching

Kajino

2018

Sci Rep

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“…Much of the research has also focused on the direct assessments of LDSA concentrations rather than the sensor evaluations themselves (e.g. Hama et al 2017;Kiriya et al 2017;Kuuluvainen et al 2016;Eeftens et al 2015;Reche et al 2015). A review of measurement techniques for workplace nanoparticle exposures noted that while the level of accuracy of diffusion charging-based sensors is fairly good, they are not on par with the performance of conventionally used research instrumentation, such as the Scanning Mobility Particle Sizers (SMPS, TSI Inc., USA) or Differential Mobility Particle Sizers (DMPS) (Asbach et al 2017).…”

Section: Aerosol Sensors In Air Quality Monitoringmentioning

confidence: 99%

Opportunities and limitations of aerosol sensors to urban air quality monitoring

Kuula¹

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Atmospheric particles are one of the leading mortality risk factors in the Global Burden of Disease study (GBD). The association between particulate mass of particles smaller than 2.5 μm in diameter (PM2.5) and cardiovascular and pulmonary diseases has been characterized by multiple epidemiological studies, and varying estimates suggest that several million premature death occur globally each year due to PM2.5 exposure. Mitigation of the adverse health effects of particulate matter requires comprehensive understanding of their sources and dynamic processes, such as spatial dispersion. Recent emergence and development of aerosol sensors, which are typically characterized as small, relatively low cost and easy to use, have enabled new opportunities in air quality monitoring. As a result of their practical convenience, sensors can be deployed to the field in high quantities which, consequently, enables network-type, spatially comprehensive measurements. However, with more simplified and less expensive measurement approach, less accurate and reliable results may be expected. This study aimed to evaluate and characterize the accuracy and usability of aerosol sensor to urban air quality measurements. The investigation focused on two of the most prominent measurement techniques applicable to sensor type monitoring; optical and diffusion chargingbased techniques. Sensors utilizing optical technique were evaluated in laboratory and field studies for their error sources and particle size-selectivity, specifically. Diffusion charging-based sensors, which measure lung deposited surface area of particles, were evaluated in the field for their suitability to measure combustion emitted particles, such as vehicular exhaust and residential wood combustion emissions. Results of the study indicated that optical aerosol sensors are unlikely to be fit for long-term regulatory monitoring. The main issues preventing this arise from their improper calibration which poses a significant risk of data misinterpretation; none of the laboratory evaluated sensors measured particle sizes which their technical specifications implied. On the other hand, field tests showed that when the measured size fraction was targeted to match the true detection range of the sensor, highly accurate and repeatable results were obtained. This implies that, while the usability of optical sensors is limited in their current form, the concept and vision of a sensor driven air quality monitoring network remains valid and achievable. In comparison to optical sensors, diffusion charging-based sensors were found to be more mature in terms of their technological development. The evaluated sensors exhibited accurate and stable performance throughout the test campaigns and were shown to be particularly well-suited the measurement of combustion emitted particles. Hence, diffusion charger sensors would be a valuable addition to be used alongside other measurement techniques as urban air quality is heavily affected by nanoparticles.

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Preface: Morphology and Internal Mixing of Atmospheric Particles

China

Mazzoleni

2018

Atmosphere

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Monthly and Diurnal Variation of the Concentrations of Aerosol Surface Area in Fukuoka, Japan, Measured by Diffusion Charging Method

Cited by 3 publications

References 18 publications

Aerosol mixing state matters for particles deposition in human respiratory system

Aerosol mixing state matters for particles deposition in human respiratory system

Opportunities and limitations of aerosol sensors to urban air quality monitoring

Preface: Morphology and Internal Mixing of Atmospheric Particles

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